If she knows to go on a potty pad, you could try putting one of those on the ground outside.
Or, you could get one of those fake grass potty spots to keep inside to get her used to the feeling of going on grass. Be sure to praise he a lot if she goes outside!
Or, you could get one of those fake grass potty spots to keep inside to get her used to the feeling of going on grass. Be sure to praise he a lot if she goes outside!